Magnesium aluminate anion exchangers
AssigneeThe Dow Chemical Company
InventorsJohn M. Lee, William C. Bauman
Life of this patent
Estimating the term…
Abstract
Preparations and uses are shown for novel crystalline aluminates which conform generally to the empirical formula MgA.sub.a.sup.v Z.sub.b.sup.v.nAl(OH).sub.3.mH.sub.2 O wherein A and Z represent negative-valence ions or radicals selected from the group comprising hydroxyl, halide, inorganic acid, and organic acid, n is a value of from about 1 to about 2, v is a negative valence of 1, 2, or 3, a and b each have values of from zero to 2, with (va)+(vb) equal to 2, and with m being a value of zero or more.
Claims7
A method for removing negative-valent ions or radicals from aqueous medium, said method comprising
- contacting said aqueous medium with crystalline Mg(OH).sub.2.nAl(OH).sub.3.mH.sub.2 O, where n is a value of from about 1 to about 2 and m is a value of zero or more, and
- where the crystalline Mg(OH).sub.2.nAl(OH).sub.3.mH.sub.2 O is supported by a substrate,
- thereby exchanging OH ions in the said crystalline material with the said negative-valence ions or radicals.
Dependencies are inferred from the claim text.